Drain valve



FIG. 1 is a top perspective view of a drain valve showing my new design in a closed position of use;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof;

FIG. 9 is a top perspective view thereof, shown in an open position of use; and,

FIG. 10 is an exploded perspective view thereof.

The broken lines depict portions of the drain valve that form no part of the claimed design. 

CLAIM The ornamental design for a drain valve, as shown and described. 